Loading [MathJax]/extensions/MathZoom.js
Elizabeth Varghese - IEEE Xplore Author Profile

Showing 1-7 of 7 results

Results

This paper is on the design of fractional controller for a class of undamped unstable linear plants. In the absence of the adequate damping the derivative control term is necessary for controlling these class of plants. The required performance specifications of the controlled system is first represented in terms of bode loop transfer function which is actually a fractional order integrator. The o...Show More
Due to high instability and non-linearity the control of magnetic levitation systems has received considerable interest, furthermore they can eliminate friction. They have wide application in in high precision positioning platforms, high speed trains, Magnetic bearings, vibration isolation systems and wind tunnel levitation systems. Fractional order (FO) controllers are among the nascent solutions...Show More
In this paper, a robust attitude and position controller is proposed for trajectory tracking of quadrotors. A robust filter is added to restrain the effect of parameter variations and external disturbances in the rotational and translational dynamics. A specific design criterion is used in the design of robust filter. To study the robustness properties of the filter a nominal PD controller is desi...Show More
Communication is the basic need of every growing area. The most popular communication medium is Internet. But communication over internet is facing some security problems. So there are many techniques are available to secure the communication. One of the major techniques available is steganography. Steganography is the process of hiding secret data from unauthorized access. Image steganography is ...Show More
Human brain known commonly as an individual's computer is one of the complex organs in the body. The brain serves to control and coordinate the mental and physical actions. It has the capacity to store innumerable data. This data includes not only childhood memories but also those related to the present age. Tracking the electrical potentials or impulses, commonly known as brain waves, can be util...Show More
Proportional Integral Derivative (PID)-type controller are the most commonly used control algorithm in industry due to their practicality. Two design techniques are presented for tuning the parameters of the controller, Zeigler-Nichols and the Åström-Hägglund method based on certain design specifications. In order to achieve better performances, different combinations of parameters from the two te...Show More
Energy harvesting on a global, sustainable and economic scale is one of the major challenges of this century. With emerging markets, industrializations and shortage of existing resources leads to develop more effective power generation and power extraction methods. Wind energy is one of the important renewable source which is rapidly growing. The performance of wind energy conversion system is gre...Show More